Hello, everyone!
I have a problem with converting shape file to obs,
I have One shape file with building polygon, in atributive table are hights of buildings without empty rows. Converting of only one file is working but output obs file is empty. I supposed that the second shape file (center points) is also necessary (it is not written in manual, actually)
Another required file is consist from central points with coordinates in attributive table.
Center points in the shape file are equal 0, because it's vertical offset coordinates as I understood (maybe I'm wrong)
Both shapes in metric system (UTM 37).
And I have always two problems:
Or empty obs files or python error that says:

Traceback (most recent call last):
File "/Users/Jane/.qgis2/python/plugins/shp_to_obs/shp_to_obs.py", line 301, in ConvertFunction
OutputDir = str(dlg2.outdir.text())
UnicodeEncodeError: 'ascii' codec can't encode characters in position 20-24: ordinal not in range(128)

Hopefully there is a way to solve my problem. I suppose I don't understand some details.
And I didn't start with trees yet!)
In raymanpro I'm interested only in comfort indexes.

Please, reply as soon as possible..
Thank you!
Best regards,
Jane

Okay, and what can be the reason why the obs file created without center points is empty? It is multiPolygon in metric system

I tried many times. With center points and without. I changed directory, I Installed QGIS 3, and nothing changed except of the python error that now says other thing:
Traceback (most recent call last):
File "/Users/Jane/Library/Application Support/QGIS/QGIS3/profiles/default/python/plugins/shp_to_obs/shp_to_obs.py", line 529, in generateObstacleFile
centerPointElevationFieldName = _mainDialog.Sel_centerpoints_field.setLayer.currentField()
AttributeError: 'builtin_function_or_method' object has no attribute 'currentField'

Regards,
Jane

Hello again,
Thanks for all the advices and sorry for double posting.
And what about the file without central points? It's just polygon in metric system. It converts, but the result is empty file. I checked with all the parameters and everything is under requirements.
Best regards